Retrieve the information associated with the selected entry in d3.js

When utilizing d3, the selection returned by *.enter() is unique in that it merely serves as a placeholder for upcoming elements. Unfortunately, this means that extracting data related to entering elements using *.data() (as with *.exit().data()) is not feasible.

I am currently faced with a scenario where the timing of multiple transitions relies on the content of entering elements prior to their instantiation.

Therefore, my inquiry is: How can I retrieve an array of the data objects that will be associated with entering elements in a data join, even before these elements are created?

javascriptd3.js

Answer №1

You have direct access to the data structures within the selection. The top level consists of a single element array which contains placeholder elements with bound data for the enter selection. All you need to do is iterate through these elements.

var enterData = selection.data(data)
    .enter()[0].map(function(d) { return d.__data__; });

For a complete demonstration, click here.

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